Example Low Power Use Cases
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SPRAC74A–February 2017–Revised March 2017
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AM335x Low Power Design Guide
4.3.1 OS Idle
Device Tree Name Ethernet SGX
am335x-evm-powersave.dtb No No
This is the lowest power consumption state, with the powersave device tree binary, and no Ethernet or
SGX enabled.
Table 8. Optimized OS Idle Power Consumption
Power Rail Voltage (V)
(1)
MPU OPP50
(300 MHz)
MPU OPP100
(600 MHz)
MPU OPP120
(720 MHz)
MPU OPP
Turbo
(800 MHz)
MPU OPP Nitro
(1000 MHz)
Power (mW) Power (mW) Power (mW) Power (mW) Power (mW)
vdd_core_power 1.1 148.71 148.73 148.75 148.74 148.73
vdd_mpu_power DVFS (0.95 -
1.325)
1.64 3.89 4.46 5.98 7.92
1.8 V I/O 1.8 32.22 33.69 34.66 35.41 37.05
3.3 V I/O 3.3 20.85 20.84 20.85 20.86 20.84
SoC Power without DDR3 203.42 207.16 208.71 210.99 214.55
vdds_ddr
(2)
1.5 139.52 141.96 138.33 138.16 140.73
vddsddrmem 1.5 94.40 94.19 93.72 92.37 92.21
DDR3 Total Power (includes VTT) 233.92 236.15 232.05 230.54 232.94
Total Power with VTT 437.34 443.31 440.76 441.53 447.49
(1) Voltages reported are nominal and will vary in actual measurements.
(2) AM335x GP EVM PMIC does not support 1.35V output for PMIC rail - power optimized designs should select proper PMIC.
Using DDR3L data sourced from the BeagleBone Black, the power consumption of a VTT-less DDR3L
system can be approximated. VDCDC1 includes both the DDR3L memory power as well as the EMIF
interface on the AM335x. SoC power from AM335x GP EVM data summarized in Table 8.
Table 9. Power Consumed by DDR on the BeagleBone Black
Power Rail Voltage (V)
(1)
MPU OPP50
(300 MHz)
MPU OPP100
(600 MHz)
MPU OPP120
(720 MHz)
MPU OPP
Turbo
(800 MHz)
MPU OPP Nitro
(1000 MHz)
Power (mW) Power (mW) Power (mW) Power (mW) Power (mW)
DCDC1
(DDR+I/O)
1.35
(2)
40.31 40.21 40.11 40.37 40.19
SoC Power 203.42 207.16 208.71 210.99 214.55
Total Power (SoC + DDR3L)
without VTT
243.73 247.37 248.82 251.36 254.74
(1) All voltages listed are nominal. Rail voltages will vary based on operating conditions and should always be measured when
collecting power data.
(2) Sourced externally by Keithley 2400 source.
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